全文获取类型
收费全文 | 222篇 |
免费 | 2篇 |
国内免费 | 18篇 |
专业分类
安全科学 | 10篇 |
废物处理 | 36篇 |
环保管理 | 14篇 |
综合类 | 27篇 |
基础理论 | 42篇 |
污染及防治 | 69篇 |
评价与监测 | 29篇 |
社会与环境 | 15篇 |
出版年
2024年 | 1篇 |
2023年 | 8篇 |
2022年 | 22篇 |
2021年 | 22篇 |
2020年 | 2篇 |
2019年 | 7篇 |
2018年 | 11篇 |
2017年 | 17篇 |
2016年 | 16篇 |
2015年 | 16篇 |
2014年 | 8篇 |
2013年 | 29篇 |
2012年 | 21篇 |
2011年 | 21篇 |
2010年 | 10篇 |
2009年 | 7篇 |
2008年 | 3篇 |
2007年 | 5篇 |
2006年 | 3篇 |
2005年 | 3篇 |
2004年 | 5篇 |
2003年 | 1篇 |
1999年 | 1篇 |
1997年 | 1篇 |
1965年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有242条查询结果,搜索用时 15 毫秒
81.
Latif MT Baharudin NH Velayutham P Awang N Hamdan H Mohamad R Mokhtar MB 《Environmental monitoring and assessment》2011,181(1-4):479-489
The renovation of a building will certainly affect the quality of air in the vicinity of where associated activities were undertaken, this includes the quality of air inside the building. Indoor air pollutants such as particulate matter, heavy metals, and fine fibers are likely to be emitted during renovation work. This study was conducted to determine the concentration of heavy metals, asbestos and suspended particulates in the Biology Building, at the Universiti Kebangsaan, Malaysia (UKM). Renovation activities were carried out widely in the laboratories which were located in this building. A low-volume sampler was used to collect suspended particulate matter of a diameter size less than 10 μm (PM??) and an air sampling pump, fitted with a cellulose ester membrane filter, were used for asbestos sampling. Dust was collected using a small brush and scope. The concentration of heavy metals was determined through the use of inductively coupled plasma-mass spectroscopy and the fibers were counted through a phase contrast microscope. The concentrations of PM?? recorded in the building during renovation action (ranging from 166 to 542 μg m?3) were higher than the value set by the Department of Safety and Health for respirable dust (150 μg m?3). Additionally, they were higher than the value of PM?? recorded in indoor environments from other studies. The composition of heavy metals in PM?? and indoor dust were found to be dominated by Zn and results also showed that the concentration of heavy metals in indoor dust and PM?? in this study was higher than levels recorded in other similar studies. The asbestos concentration was 0.0038 ± 0.0011 fibers/cc. This was lower than the value set by the Malaysian Department of Occupational, Safety and Health (DOSH) regulations of 0.1 fibers/cc, but higher than the background value usually recorded in indoor environments. This study strongly suggests that renovation issues need to be considered seriously by relevant stakeholders within the university in order to ensure that the associated risks toward humans and indoor environment are eliminated, or where this is not feasible, minimized as far as possible. 相似文献
82.
Spatial water quality assessment of Langat River Basin (Malaysia) using environmetric techniques 总被引:6,自引:0,他引:6
Hafizan Juahir Sharifuddin M. Zain Mohd Kamil Yusoff T. I. Tengku Hanidza A. S. Mohd Armi Mohd Ekhwan Toriman Mazlin Mokhtar 《Environmental monitoring and assessment》2011,173(1-4):625-641
This study investigates the spatial water quality pattern of seven stations located along the main Langat River. Environmetric methods, namely, the hierarchical agglomerative cluster analysis (HACA), the discriminant analysis (DA), the principal component analysis (PCA), and the factor analysis (FA), were used to study the spatial variations of the most significant water quality variables and to determine the origin of pollution sources. Twenty-three water quality parameters were initially selected and analyzed. Three spatial clusters were formed based on HACA. These clusters are designated as downstream of Langat river, middle stream of Langat river, and upstream of Langat River regions. Forward and backward stepwise DA managed to discriminate six and seven water quality variables, respectively, from the original 23 variables. PCA and FA (varimax functionality) were used to investigate the origin of each water quality variable due to land use activities based on the three clustered regions. Seven principal components (PCs) were obtained with 81% total variation for the high-pollution source (HPS) region, while six PCs with 71% and 79% total variances were obtained for the moderate-pollution source (MPS) and low-pollution source (LPS) regions, respectively. The pollution sources for the HPS and MPS are of anthropogenic sources (industrial, municipal waste, and agricultural runoff). For the LPS region, the domestic and agricultural runoffs are the main sources of pollution. From this study, we can conclude that the application of environmetric methods can reveal meaningful information on the spatial variability of a large and complex river water quality data. 相似文献
83.
Babalghaith Ali Mohammed Koting Suhana Sulong Nor Hafizah Ramli Khan Md Zahid Hossain Milad Abdalrhman Yusoff Nur Izzi Md. Ibrahim Mohd Rasdan Mohamed Abdul Halim bin Nagor 《Environmental science and pollution research international》2022,29(24):35557-35582
Environmental Science and Pollution Research - The daily utilization of a large amount of raw materials is causing a rapid depletion of natural resources. The growth of the human population is... 相似文献
84.
Pang Swee Yun Suratman Suhaimi Latif Mohd Talib Khan Md Firoz Simoneit Bernd R. T. Mohd Tahir Norhayati 《Environmental science and pollution research international》2022,29(11):15849-15862
Environmental Science and Pollution Research - Surface sediments along the Southern Terengganu coast (≤7 km from the coast) were analyzed for polycyclic aromatic hydrocarbons (PAHs). The... 相似文献
85.
Environmental Modeling & Assessment - A key problem in ecology is to predict the presence/absence of species across a geographical region. Addressing this problem in a multi-species community... 相似文献
86.
Rotenone is an active ingredient that has been widely used as pesticide. However, rotenone is poorly soluble in water. Therefore, a water-soluble carrier is needed. Here, we synthesised, characterised and applied oleoyl-carboxymethyl chitosan for the first time as a carrier agent for rotenone. Oleoyl-carboxymethyl chitosan is soluble in acidic, neutral and basic media. The critical micelle concentration of oleoyl-carboxymethyl chitosan is 0.096 mg/mL. Oleoyl-carboxymethyl chitosan formed self-aggregates and exhibited spherical shape with the values of 35.5–66.4 nm. We studied the encapsulation efficiency and loading capacity of oleoyl-carboxymethyl chitosan micelles with different weight ratios of oleoyl-carboxymethyl chitosan to rotenone. We found an encapsulation efficiency of 97 % and a loading capacity of 0.97 % for oleoyl-carboxymethyl chitosan/rotenone 100:1 w/w. Oleoyl-carboxymethyl chitosan released 96.00 % of the rotenone loaded within 50 h. Overall, our findings show the feasibility of oleoyl-carboxymethyl chitosan as a novel water-solubilising agent for pesticide formulations. 相似文献
87.
The adsorption of a synthetic textile dye (Remazol Brilliant Black Reactive) on cocoa pod husk-based activated carbon was investigated in batch process. The adsorbent prepared was characterized by gas adsorption surface analysis (Brunauer Emmett Teller, BET), scanning electron microscopy, and Fourier transform infrared spectroscopy. The effects of initial dye concentration, contact time, solution temperature, and solution pH were evaluated. Equilibrium data were fitted to Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherm models, the first being the best with maximum monolayer coverage of 111?mg?g?1. Kinetic data were fitted into pseudo-first-order, pseudo-second-order, intraparticle diffusion, and Elovich models; the pseudo second-order model provided the best correlation. Maximum adsorption was observed at pH 7. Standard free energy, standard enthalpy, and standard entropy were also calculated. The adsorption interaction was found to be endothermic and spontaneous. Both the mean free energy of adsorption and the activation energy show that the mechanism is by physisorption. 相似文献
88.
Fresh and healthy specimens of Oreochromis niloticus (mean weight 70.5± 1.23 g and mean length, 12.3± 1.5cm) and Clarias gariepinus (mean weight, 41.8±2.3 g and mean length 13.78 ± 1.2 cm) were exposed to heavy metal lead, ranging in concentration from 10 to 18 mg L‐1 for O. niloticus and 20 to 28 mg L‐1 for C. gariepinus respectively. The 96 h LC50 for both the species was computed as 12.45 mg L‐1 (O. niloticus) and 22.65 mg L‐1 (C. gariepinus). The cichlid fish was exposed to sublethal concentration of lead (2, 4 and 6 mgL‐1) and catfish (4, 8 and 12 mgL‐1). The erythrocytes count, haemoglobin concentration, haematocrit and the value of serum glucose increased significantly (P < 0.01), whereas leucocytes count, serum protein and serum triglyceride after intoxication declined in both the species with the same pattern but in different quantity. After 96 h of time a significant depletion of muscle and liver glycogen was noted, being greater in muscle (16.7% in O. niloticus) and in liver (15.9% in C. gariepinus). The response of fish to lead was dose dependent. 相似文献
89.
Malik Nur Khaliesah Abdul Manaf Latifah Abd Jamil Nor Rohaizah Rosli Mohd Hafiz Ash’aari Zulfa Hanan Othman Mohamad Al-Ekhwan 《Journal of Material Cycles and Waste Management》2021,23(4):1289-1302
Journal of Material Cycles and Waste Management - The accumulation of floatable litter load captured in gross pollutant trap (GPT) due to the hydrological runoff has become challenging due to rapid... 相似文献
90.
Kawata Yukichika Yusoff Fatimah Md Khong Nicholas M. H. Umi Dini W. A. 《Journal of Material Cycles and Waste Management》2021,23(3):1026-1036
Journal of Material Cycles and Waste Management - Fruit wastes, including the rind, skin, pulp, and seed, contain highly nutritious organic materials; however, they are often discarded without... 相似文献